JP6251799B1 - Rollable display device - Google Patents

Abstract

[PROBLEMS] To facilitate the winding and unwinding operations of a flexible display panel while reinforcing the rigidity of the flexible display panel. A rollable display device according to the present invention includes a flexible display panel capable of winding and unwinding, and one end of the flexible display panel fixed to one end of the flexible display panel, and is wound and unwound together with the flexible display panel. And a soft magnet fixed to any one of the soft display panel and the back cover between the soft display panel and the back cover. [Selection] Figure 9

Description

  The present invention relates to a rollable display device.

  With the development of information technology, the market for display devices, which are connection media between users and information, is growing. As a result, the use of display devices such as organic light emitting display (OLED), liquid crystal display (LCD), and plasma display panel (PDP) is increasing. is there.

  Among them, since the organic light emitting diode display device is a self-luminous element, it consumes less power than a liquid crystal display device that requires a backlight and can be made thinner. In addition, the organic light emitting diode display device has an advantage of a wide viewing angle and a high response speed. Organic light-emitting diode display devices have developed process technology to the level of mass production technology for large screens, and are expanding the market while competing with liquid crystal display devices.

  The pixel of the organic light emitting diode display device includes organic light emitting diode (hereinafter referred to as “OLED”) which is a self light emitting element. Organic light emitting diode display devices can be divided into various types according to the type of light emitting material, light emitting method, light emitting structure, driving method, and the like. The organic light emitting diode display device is divided into a fluorescent emission and a phosphorescent emission according to a light emission method, and is divided into a front emission structure and a bottom emission structure according to a light emission structure. The organic light emitting diode display device is divided into a PMOLED (Passive Matrix OLED) and an AMOLED (Active Matrix OLED) according to a driving method.

  Recently, flexible display devices have been commercialized. The flexible display device can reproduce the input image on the screen of the display panel on which the plastic OLED is formed. The plastic OLED is formed on a plastic substrate that can be bent. The flexible display device can implement various designs and has advantages in portability and durability. The flexible display device may be implemented in various forms, such as a bendable display device, a foldable display device, and a rollable display device. Such flexible display devices can be applied not only to mobile devices such as smartphones and tablet PCs, but also to TVs, automobile displays, wearable devices, and the like, and their application fields are expanding.

  The rollable display device can be rolled up and opened as needed. The display panel preferably has a relatively thin thickness and light weight in order to easily roll or open and provide an improved aesthetic in design. However, physical durability decreases as the display panel becomes thinner and lighter. Thereby, the display panel is easily damaged by the external force provided, which reduces the reliability of the product and the stability of the product. Therefore, efforts to improve this are required.

  An object of the present invention is to provide a rollable display device capable of facilitating winding and unwinding operations of a flexible display panel while reinforcing the rigidity of the flexible display panel.

  A rollable display device according to the present invention includes a flexible display panel that can be wound and unwound, a back cover that has one end fixed to one end of the flexible display panel, and is wound and unwound together with the flexible display panel. And a soft magnet fixed to any one of the flexible display panel and the back cover between the flexible display panel and the back cover.

1 is a diagram schematically showing a rollable display device according to the present invention. It is the block diagram which showed schematically the pixel shown in FIG. It is a figure which shows an example of the circuit block diagram in the pixel shown in FIG. It is the figure which showed the structure of the modularized flexible display panel. It is a figure for demonstrating the usage example of the rollable display apparatus by this invention. It is a figure for demonstrating the usage example of the rollable display apparatus by this invention. It is a figure for demonstrating the structure of the rollable display apparatus by this invention. It is a figure for demonstrating the structure of the rollable display apparatus by this invention. It is a figure for demonstrating the structure of the rollable display apparatus by this invention. It is a figure for demonstrating the structure of the rollable display apparatus by this invention. It is a figure for demonstrating the structure of the rollable display apparatus by this invention. 1 is a perspective view showing a rollable display device according to a first embodiment of the present invention. It is a figure for demonstrating the operation state of the rollable display apparatus by the 1st Embodiment of this invention. It is a perspective view which shows the rollable display apparatus by the 2nd Embodiment of this invention. It is a figure for demonstrating the structure and operation | movement of an elastic structure. It is a figure for demonstrating the operation state of the rollable display apparatus by the 2nd Embodiment of this invention. It is a figure for demonstrating the operation state of the rollable display apparatus by the 2nd Embodiment of this invention. It is a figure for demonstrating the operation state of the rollable display apparatus by the 2nd Embodiment of this invention. It is a figure for demonstrating the operation state of the rollable display apparatus by the 2nd Embodiment of this invention. It is a figure for demonstrating the rollable display apparatus by the 3rd Embodiment of this invention. It is a figure for demonstrating the rollable display apparatus by the 3rd Embodiment of this invention. It is a figure for demonstrating the rollable display apparatus by the 3rd Embodiment of this invention. It is a figure for demonstrating the rollable display apparatus by the 3rd Embodiment of this invention. It is a figure for demonstrating the rollable display apparatus by the 4th Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Throughout the specification, the same reference numbers refer to substantially identical components. In the following description, if it is determined that a specific description of known techniques and configurations related to the present invention unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Further, the names of the components used in the following description are selected in consideration of the ease of creating the specification, and may be different from the actual product part names. When a plurality of embodiments are described, substantially the same components are representatively described at the beginning, and can be omitted in other embodiments. In describing a plurality of embodiments, the same components are typically described at the beginning and can be omitted in other embodiments.

  Terms including ordinal numbers such as first, second, etc. are used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

  The display device according to the present invention includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an organic light emitting display (Organic Light Emitting). display, OLED), electrophoretic display element (Electrophoresis, EPD), and quantum dot display (QDD). Hereinafter, for convenience of explanation, a case where a rollable display device includes an organic light emitting diode (hereinafter, referred to as OLED) element will be described as an example.

  FIG. 1 is a view schematically showing a rollable display device according to the present invention. FIG. 2 is a block diagram schematically showing the pixel shown in FIG. FIG. 3 is a diagram illustrating an example of a circuit configuration diagram in the pixel illustrated in FIG. 1. FIG. 4 is a diagram showing the structure of a modularized flexible display panel.

  Referring to FIG. 1, a rollable display device 10 according to the present invention includes a display driving circuit and a flexible display panel 100.

  The display driving circuit includes a data driving circuit 12, a gate driving circuit 14, and a timing controller 16, and writes a video data voltage of an input image to a pixel of the flexible display panel 100. The data driving circuit 12 converts the digital video data RGB input from the timing controller 16 into an analog gamma compensation voltage to generate a data voltage. The data voltage output from the data driving circuit 12 is supplied to the data lines D1 to DM. The gate driving circuit 14 sequentially supplies a gate signal synchronized with the data voltage to the gate lines G1 to GN, and selects a pixel of the flexible display panel 100 to which the data voltage is written.

  The timing controller 16 receives timing signals such as a vertical synchronization signal VSYNC, a horizontal synchronization signal HSYNC, a data enable signal (Data Enable, DE), a main clock MCLK, and the like, which are input from the host system 19, and drives the data driving circuit 12 and the gate. The operation timing with the circuit 14 is synchronized. Data timing control signals for controlling the data driving circuit 12 include a source sampling clock (SSC), a source output enable signal (Source Output Enable, SOE), and the like. The gate timing control signal for controlling the gate driving circuit 14 includes a gate start pulse (Gate Start Pulse, GSP), a gate shift clock (Gate Shift Clock, GSC), a gate output enable signal (Gate Output Enable, GOE), and the like. Including.

  The host system 19 is embodied by any one of a television system, a set top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, and a phone system. The host system 19 includes an SOC (System on chip) with a built-in scaler and converts the digital video data RGB of the input video into a format suitable for display on the flexible display panel 100. The host system 19 transmits timing signals (Vsync, Hsync, DE, MCLK) to the timing controller 16 together with the digital video data.

  The pixel array of the flexible display panel 100 includes pixels formed in pixel regions defined by data lines D1 to Dm (m is a positive integer) and gate lines G1 to Gn (n is a positive integer). Each of the pixels includes an OLED that is a self-luminous element.

  Referring further to FIG. 2, in the flexible display panel 100, a large number of data lines D and a large number of gate lines G intersect, and pixels are arranged in a matrix form in each intersecting region. Each of the pixels is an OLED, a driving thin film transistor (hereinafter referred to as “TFT”) DT that controls the amount of current flowing in the OLED, and a programming for setting a gate-source voltage of the driving TFT (DT). Part SC is included.

  The programming unit SC may include at least one switch TFT and at least one storage capacitor. The switch TFT is turned on in response to the gate signal from the gate line G, thereby applying the data voltage from the data line D to the one side electrode of the storage capacitor. The driving TFT (DT) adjusts the light emission amount of the OLED by controlling the amount of current supplied to the OLED according to the magnitude of the voltage charged in the storage capacitor. The light emission amount of the OLED is proportional to the amount of current supplied from the driving TFT (DT). Such a pixel is connected to a high potential voltage source EVDD and a low potential voltage source EVSS, and receives a high potential power supply voltage and a low potential power supply voltage from a power generation unit (not shown), respectively. The TFT constituting the pixel is implemented by p-type or n-type. In addition, the semiconductor layer of the TFT constituting the pixel can include amorphous silicon, polysilicon, or oxide. The OLED includes an anode electrode ANO, a cathode electrode CAT, and an organic compound layer interposed between the anode electrode ANO and the cathode electrode CAT. The anode electrode ANO is connected to the driving TFT (DT).

  Still referring to FIG. 3, the pixel is composed of 6T (Transistor) 1C (Capacitor). However, the pixel configuration of the present invention is not limited to the 6T 1C structure. That is, the present invention can include all OLED pixel structures that use a method of adjusting the current flowing in the OLED using the driving TFT.

  Hereinafter, the TFT included in the pixel will be described as an example of a p-type, but the present invention is not limited to this, and the TFT may be an n-type. Since the positions of the source electrode and the drain electrode differ depending on the type of TFT, in the following description, these are referred to as a first electrode and a second electrode.

  The first TFT (T1) includes a gate electrode connected to the first a gate line GL1a, a first electrode connected to the first data line DL1, and a second electrode connected to one end of the storage capacitor Cstg. The first TFT T1 serves to transmit a data voltage supplied through the first data line DL1 to the storage capacitor Cstg in response to the first gate signal SCAN1.

  The second TFT (T2) includes a gate electrode connected to the 1b gate wiring GL1b, a first electrode connected to the gate electrode of the driving TFT (DT), and a second electrode connected to the second electrode of the driving TFT (DT). Including. The second TFT (T2) plays a role of bringing the gate electrode and the source electrode node of the driving TFT (DT) into a diode connection state in response to the 1b gate signal SCAN2.

  The third TFT (T3) includes a gate electrode connected to the first c gate line GL1c, a first electrode connected to the reference voltage line VREF, and a second electrode connected to one end of the storage capacitor Cstg. The third TFT T3 serves to supply a reference voltage Vref (or compensation voltage) to one end of the storage capacitor Cstg in response to the first c gate signal EM.

  The fourth TFT (T4) includes a gate electrode connected to the first c gate wiring GL1c, a first electrode connected to the second electrode of the driving TFT (DT), and a second electrode connected to the anode electrode of the organic light emitting diode OLED. . The fourth TFT T4 transmits the driving current to the organic light emitting diode OLED in response to the 1b gate signal SCAN2, and plays the role of emitting light.

  The fifth TFT (T5) includes a gate electrode connected to the first b gate line GL1b, a first electrode connected to the reference voltage line VREF, and a second electrode connected to the anode electrode of the organic light emitting diode OLED. The fifth TFT T5 serves to supply the reference voltage Vref to the anode electrode of the organic light emitting diode OLED in response to the 1b gate signal SCAN2.

  The driving TFT (DT) has a gate electrode connected to the other end of the storage capacitor Cstg, a first electrode connected to the first power supply (or high potential voltage source) EVDD, and a first electrode connected to the first electrode of the fourth TFT (T4). Includes two electrodes. The driving TFT (DT) is turned on in response to the data voltage supplied from the storage capacitor Cstg, and generates a driving current supplied to the organic light emitting diode OLED.

  The organic light emitting diode OLED includes an anode electrode connected to the second electrode of the fourth TFT (T4) and a cathode electrode connected to the second power source (or low potential voltage source) EVSS. The organic light emitting diode OLED emits light corresponding to the driving current transmitted through the fourth TFT (T4).

Referring further to FIG. 4, the flexible display panel 100 includes a timing controller (16 in FIG. 1), a data driving circuit 12, a gate driving circuit 14 and the like (a host system (19 in FIG. 1) and a power generation unit are not shown). Are electrically connected and connected to form a module.
The gate driving circuit 14 is formed on the flexible display panel 100 by the GIP method. That is, in order to easily wind and unwind the flexible display panel 100, it is preferable to form the gate driving circuit 14 by the GIP (Gate In Panel) method on the left side, the right side, or the left and right sides of the display area AA. However, it is not limited to this.

  A data printed circuit board (printed circuit board, hereinafter referred to as “PCB”) 20 is electrically connected to the flexible display panel 100 via a first connection member 25. The first connection member 25 may be a COF (Chip On Film) on which the data driving circuit 12 is mounted, but is not limited thereto. For example, the first connection member 25 is implemented by a TCP (Tape Carrier Package) method, and can electrically connect the data PCB 20 and the flexible display panel 100.

  The data PCB 20 is connected to the control board 30 via the second connection member 35. There may be a plurality of second connection members 35. A timing controller 16 and the like are mounted on the control board 30. The second connecting member 35 may be an FFC (Flexible Flat Cable), but is not limited thereto. The control board 30 is connected to a host system (19 in FIG. 1), a power generation unit, and the like via a connection cable.

  5 and 6 are diagrams for explaining an example of use of the rollable display device according to the present invention.

  Referring to FIG. 5, a modularized flexible display panel (hereinafter abbreviated as a flexible display panel) 100 includes a display area in which an input image is embodied. The user can recognize information output from the flexible display panel 100 via the display area. The front surface of the flexible display panel 100 means one surface of the flexible display panel 100 in which a display area is defined. On the other hand, the back surface of the flexible display panel 100 means one surface in a direction opposite to the front surface of the flexible display panel 100 in which the user cannot recognize the display area.

  The flexible display panel 100 can be wound and unwound. That is, a predetermined softness is imparted to the flexible display panel, and the roll (rolling or winding) or opening (unrolling or unwinding) operation can be easily and repeatedly performed. The flexible display panel 100 may be wound in the front direction of the flexible display panel 100 (Inner rolling), or may be wound in the rear direction of the flexible display panel 100 (Outer rolling). Hereinafter, for convenience of explanation, a case where the flexible display panel is wound in the back direction will be described as an example unless otherwise limited.

  Referring to FIG. 6, the state change (winding and unwinding) of the flexible display panel 100 may be due to a physical external force directly provided by the user. For example, the user can embody a change in the state of the flexible display panel 100 by holding one end of the flexible display panel 100 and providing force to the one end (FIG. 6A).

  The state change of the flexible display panel 100 may be controlled through a control unit in response to a preset specific signal. That is, the state change of the flexible display panel 100 is controlled by the selected driving device and driving circuit.

  The flexible display panel 100 may be wound around an instrument such as a panel roller 150. The panel roller 150 can have a substantially cylindrical shape. That is, the cross-sectional shape of the panel roller 150 may be a circle. However, the present invention is not limited to this, and the panel roller 150 may be implemented in any shape as long as the flexible display panel 100 can be easily wound. The panel roller 150 is driven by a driving device such as a motor. The driving device may be a tubular motor. In this case, the driving device may be provided in the panel roller 150. However, it is not limited to this. The driving device can convert electrical energy into mechanical energy in synchronization with a signal from the control unit, and can provide mechanical energy to the panel roller 150. The flexible display panel 100 is wound and unwound in conjunction with the panel roller 150.

  Although not shown, the flexible display panel 100 can be wound along the guide rail in synchronization with the mechanical energy provided from the driving device. The guide rail can have a spiral shape (or coil shape). The flexible display panel 100 is guided along the trajectory of the guide rail. The flexible display panel 100 in a state of being wound along the guide rail is provided such that a predetermined interval is separated without the surfaces facing each other. Therefore, collision and interference that can occur between the surfaces of the flexible display panel 100 when winding is minimized.

  The rollable display device may be implemented in such a manner that the flexible display panel 100 moves up and down with the panel roller 150 or the guide rail fixed, and the panel roller 150 or the guide with one end of the flexible display panel 100 fixed. It is embodied in a form in which the rail moves up and down.

  7 to 11 are views for explaining the structure of a rollable display device according to the present invention.

  Referring to FIG. 7, the rollable display device according to the present invention includes a flexible display panel 100 and a back cover 200 provided on the back surface of the flexible display panel 100.

  The flexible display panel 100 can be rolled or opened to maintain the first state and the second state. The first state means a state where the flexible display panel 100 is wound up. The first state may be a state in which the user cannot recognize the display area outside since the display area of the flexible display panel 100 is not exposed to the outside. The first state may be a state in which an input image is not realized because the display device is turned off.

  The second state means a state where the flexible display panel 100 is wound up. In the second state, the flexible display panel 100 can maintain a substantially flat shape. The second state may be a state in which the user can recognize the display area of the flexible display panel 100 and receive necessary information. The second state may be a state in which an input image is realized by turning on the display device.

  If necessary, the flexible display panel 100 can change from the first state to the second state and from the second state to the first state.

  The back cover 200 supports the back surface of the flexible display panel 100 and reinforces the rigidity of the flexible display panel 100. By further providing the back cover 200, the physical durability of the flexible display panel 100 can be improved. The back cover 200 may include a material that is light and has high strength. For example, the back cover 200 is formed of any one of GFRP (Glass Fiber Reinforced Plastics), CFRP (Carbon Fiber Reinforced Plastics), aluminum, and plastic.

  One end of the back cover 200 is fixed to one end of the flexible display panel 100. That is, one end of the back cover 200 and the flexible display panel 100 is fixed in a region where the back cover 200 and the flexible display panel 100 start to be wound. This means that one end of the back cover 200 and the flexible display panel 100 is fixed, and the movement of each other is restricted and restricted.

  The back cover 200 may have a size and shape corresponding to the flexible display panel 100. The size and shape of the back cover 200 are selected within a range that does not constrain or limit the free deformation of the flexible display panel 100.

Referring to FIGS. 8A and 8B, when the flexible display panel 100 and the back cover 200 are wound around one central axis, the rotation axis is between the flexible display panel 100 and the back cover 200. A length deviation D is generated due to the difference between the winding radii r1 and r2.
Referring to FIG. 8C, when the back cover 200 and the flexible display panel 100 whose whole surfaces are fixed to each other via an adhesive are wound up, the buckling ( Buckling, delamination and cracking can occur. This can be a further problem when implementing a rollable display device having a compact design. That is, when it is assumed that the lengths of the flexible display panel 100 and the back cover 200 are constant, the number of windings increases as the winding radius decreases, and the length deviation increases further as the number of windings increases. In the state where the back cover 200 and the flexible display panel 100 are simply bonded, there is a problem because the probability of occurrence of buckling, peeling, cracking, etc. increases as the length deviation increases.

  Referring to FIG. 9, the present invention further includes a soft magnet 250 provided between the flexible display panel 100 and the back cover 200 in order to solve the above-described problem. The soft magnet 250 is given predetermined softness, and is wound and unwound when the flexible display panel 100 is wound and unwound.

  The soft magnet 250 may be a rubber magnet. Rubber magnets have the advantages that they have elasticity and flexibility and are easy to process. The soft magnet 250 may have a size and shape corresponding to the flexible display panel 100 and / or the back cover 200. The size and shape of the soft magnet 250 are selected within a range that does not restrict or limit the free deformation of the flexible display panel 100.

  The soft magnet 250 is fixed to any one of the flexible display panel 100 and the back cover 200. When the soft magnet 250 is fixed to the back cover 200, the soft magnet 250 is brought into contact with the soft display panel 100 so as to be slidable or slipped by an attractive force between the soft magnet 250 and the soft display panel 100.

  For example, when the flexible display panel 100 includes an OLED element, the flexible display panel 100 may further include an FSM (Face Seal Material) layer for blocking moisture or oxygen penetrating into the OLED. The FSM layer can include invar. Invar is an iron (Fe) or nickel (Ni) alloy having a low coefficient of thermal expansion. Therefore, the soft magnet 250 is slidably contacted with the soft display panel 100 by the attractive force between the soft magnet 250 and the FSM layer.

  When the soft magnet 250 is fixed to the soft display panel 100, the soft magnet 250 is brought into sliding contact with the back cover 200 by the attractive force between the soft magnet 250 and the back cover 200. In this case, the back cover 200 may be formed of a metal, a plastic magnet, or the like, or may be formed of a structure in which a metal, a plastic magnet, or the like is attached to a rigid member.

  In the case of the flexible display panel 100 having a plurality of layers, the position of the neutral plane is selectively selected in order to prevent damage that may occur to a specific layer when the flexible display panel 100 is wound and unwound. Control. If the soft magnet 250 is fixed to the flexible display panel 100 in a state where the position of the neutral surface is set, the neutral surface of the flexible display panel 100 changes, and undesired damage can occur in the specific layer. In order to prevent this, the soft magnet 250 may be preferably fixed to the back cover 200. Hereinafter, for convenience of explanation, the case where the soft magnet 250 is fixed to the back cover 200 and the soft magnet 250 fixed to the back cover 200 is brought into sliding contact with the flexible display panel 100 will be described as an example. .

  Hereinafter, the mutual operation relationship between the flexible display panel 100 and the back cover 200 according to the winding and unwinding operations of the flexible display panel 100 will be described with further reference to FIG.

  Further referring to FIG. 10, the flexible display panel 100 is slid (circle 2) in the first direction along the surface of the back cover 200 to which the soft magnet 250 is fixed while being rolled (circle 1). That is, since the flexible display panel 100 is wound up with one end thereof fixed to the one end of the back cover 200, the length between the flexible display panel 100 and the back cover 200 according to the degree of winding. Deviation occurs. In response to the increase in the length deviation, the flexible display panel 100 is slid in the first direction along the surface of the back cover 200 to which the soft magnet 250 is fixed ((a) of FIG. 10).

  The flexible display panel 100 is slid (circle 4) in the second direction along the surface of the back cover 200 to which the soft magnet 250 is fixed while being unwound (circle 3). That is, since the flexible display panel 100 is unwound in a state where one end of the flexible display panel 100 is fixed to the one end of the back cover 200, the flexible display panel 100 is generated between the flexible display panel 100 and the back cover 200 according to the degree of winding. The length deviation is reduced sequentially. Corresponding to the decrease in the length deviation, the flexible display panel 100 is slid in the second direction along the surface of the back cover 200 to which the soft magnet 250 is fixed ((b) of FIG. 10).

  The preferred embodiment of the present invention further includes the soft magnet 250 to restrain the flexible display panel 100 and the back cover 200 from being separated from each other while winding and unwinding the flexible display panel 100. In conjunction, the flexible display panel 100 can be guided to slide on the back cover 200. That is, due to the winding and unwinding operations of the flexible display panel 100, the length deviation between the flexible display panel 100 and the back cover 200 is sensitized. In order to compensate for the length deviation, The soft magnet 250 is slid along the surface of the back cover 200 to which the soft magnet 250 is fixed. Therefore, the preferred embodiment of the present invention can prevent defects such as buckling, peeling, and cracking by compensating for the length deviation that occurs when the flexible display panel 100 and the back cover 200 are wound and unwound.

  On the other hand, in order to compensate for the length deviation between the flexible display panel 100 and the back cover 200, a method including separate rollers for driving the flexible display panel 100 and the back cover 200 can be considered. However, such a method has a considerable difficulty in synchronizing the rollers, and has a problem that it is difficult to implement a display device having a compact design by providing a large number of rollers. In contrast, the preferred embodiment of the present invention can compensate for the length deviation between the flexible display panel 100 and the back cover 200 using only the soft magnet 250, thereby improving the reliability and stability of the product. A rollable display device that realizes a compact design while ensuring it can be provided.

  Referring to FIG. 11, when the flexible display panel 100 is wound and unwound, the flexible display panel 100 is slid on the soft magnet 250. However, when the magnetic force of the soft magnet 250 is strong, the soft display panel 100 to which the predetermined softness is imparted may not be slid along the surface of the soft magnet 250 and may fail to float locally from the soft magnet 250. This becomes a further problem in large area rollable display devices. On the contrary, when the magnetic force of the soft magnet 250 is weak, the back cover 200 is separated from the soft display panel 100 to support the back surface of the soft display panel 100 and reinforce the rigidity of the soft display panel 100. It becomes impossible to perform the function.

  The magnetic force of the soft magnet 250 is appropriately selected in consideration of the above problems. For example, the magnetic force of the soft magnet 250 is selected in consideration of the direction and interval of the lines of magnetic force and the thickness of the soft magnetism. The magnetic force of the soft magnet 250 is selected so that it can change gradually according to its position.

  The flexible display panel 100 may include a plurality of soft magnets 250 that are divided. Depending on the position, the interval between the adjacent soft magnets 250 may be different from each other. For example, the interval between adjacent soft magnets 250 may be narrower in a region where a strong magnetic force is required than in a region where a strong magnetic force is not required. Depending on the position, the magnetic forces of the arranged soft magnets 250 may be different from each other. That is, a soft magnet 250 having a relatively strong magnetic force can be provided in a region where a strong magnetic force is required compared to a region where a strong magnetic force is not required. For example, a region where a strong magnetic force is not required can be provided with an isotropic rubber magnet, and a region where a strong magnetic force is required can be provided with an anisotropic rubber magnet. The arrangement density of the soft magnets 250 provided may vary depending on the position. For example, the arrangement density of the soft magnets 250 may be higher in a region where a strong magnetic force is required than in a region where a strong magnetic force is not required.

  Hereinafter, with reference to the attached drawings, an embodiment for preventing a defect in which the flexible display panel 100 locally floats from the soft magnet 250 and a defect in which the flexible display panel 100 is separated from the soft magnet 250 will be described. To do.

  <First Embodiment>

  Hereinafter, the rollable display device according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a perspective view showing a rollable display device according to the first embodiment of the present invention. FIG. 13 is a diagram for explaining an operation state of the rollable display device according to the first embodiment of the present invention.

  Referring to FIG. 12, the rollable display device according to the first exemplary embodiment of the present invention includes a panel roller 150, a flexible display panel 100, a back cover 200, a soft magnet 250, and a first elastic member 300.

  The panel roller 150 can have a substantially cylindrical shape. That is, the cross-sectional shape of the panel roller 150 may be a circle. However, the present invention is not limited to this, and the panel roller 150 may be implemented in any shape as long as the flexible display panel 100 can be easily wound.

  The panel roller 150 may be provided with an internal space that can accommodate the control board 30. The internal space may further include a fixing structure that can fix the control board 30. The fixed structure is provided inside the panel roller 150, and by fixing the control board 30, it is possible to prevent the control board 30 from being detached and to collide with other structures. This means that the movement of the control board 30 can be restricted and restricted inside the panel roller 150. When the control board 30 is built in the panel roller 150, the space utilization can be improved, and since it is not recognized outside, there is an advantage that a clean aesthetic sense can be given to the user.

  However, the present invention is not limited to this, and the control board 30 can be provided outside the panel roller 150. In this case, the control board may be provided on the other side opposite to the one side of the flexible display panel 100 fixed to the panel roller 150. When the control board 30 is provided outside the panel roller 150, the thickness of the panel roller 150 can be reduced, so that there is an advantage that a rollable display device having a compact design can be provided.

  A driving unit that drives the panel roller 150 may be provided in the internal space of the panel roller 150. The driving unit may be a tubular motor, but is not limited thereto. The driving unit is connected to a power generation unit such as a separate external power source or a built-in battery, and can receive power. The panel roller 150 can be rotated by receiving a rotational force from the driving unit. The flexible display panel 100 and the back cover 200 are wound and unwound around the panel roller 150 in conjunction with the rotational movement of the panel roller 150.

  The flexible display panel 100 includes a display area where an input image is implemented. The display area is defined in at least a partial area of the flexible display panel 100. The display area includes a number of pixels. In the drawing, the case where the planar shape of the flexible display panel 100 has a substantially rectangular shape is shown as an example, but the present invention is not limited to this. The planar shape of the flexible display panel 100 may be a free form including a circle.

  The flexible display panel 100 is wound and unwound around the panel roller 150. The back cover 200 is provided in the back direction of the flexible display panel 100 and supports the flexible display panel 100. The back cover 200 is wound and unwound around the panel roller 150 together with the flexible display panel 100.

  In the region where the flexible display panel 100 and the back cover 200 start to be wound, the one end of the back cover 200 and the one end of the flexible display panel 100 are fixed to each other. This means that one end of the flexible display panel 100 and one end of the back cover 200 are fixed, and their movements can be restricted and restricted.

  One end of the fixed flexible display panel 100 and one end of the back cover 200 are fixed to the panel roller 150. One area of the panel roller 150 in which one end of the flexible display panel 100 and one end of the back cover 200 are fixed is an area where the flexible display panel 100 and the back cover 200 start to be wound. For this reason, an adhesive member or a fixing member for fixing these is provided between one end of the flexible display panel 100 and the panel roller 150 or between one end of the back cover 200 and the panel roller 150. Further can be provided.

  The soft magnet 250 is fixed to one surface of the back cover 200 that faces the flexible display panel 100. The soft magnet 250 is provided between the flexible display panel 100 and the back cover 200 and guides a sliding operation corresponding to a length deviation generated when the flexible display panel 100 and the back cover 200 are wound and unwound.

  When the flexible display panel 100 and the back cover 200 are unwound from the panel roller 150, the sliding of the flexible display panel 100 is not smooth due to the magnetic force of the soft magnet 250, and the flexible display panel 100 is localized from the surface of the back cover 200. Defects that float on the surface can occur. In order to prevent this, the first embodiment of the present invention further includes a first elastic member 300.

The first elastic member 300 can be deformed corresponding to the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200. When the flexible display panel 100 is in the second state, the length deviation is a degree (or size) deviating from the reference with respect to the positions of the other end of the flexible display panel 100 and the other end of the back cover 200. ).
For example, the first elastic member 300 may be a tension spring. When the length deviation between the flexible display panel 100 and the back cover 200 increases, the tension spring is pulled correspondingly, and when the length deviation between the flexible display panel 100 and the back cover 200 decreases, It can be elastically restored in response to

  One end of the first elastic member 300 is connected to the other end of the back cover 200. As an example, a load bar 310 may be further provided at the other end of the flexible display panel 100, and one end of the first elastic member 300 may be fixed to the load bar 310. The load bar 310 has a predetermined load.

  The load bar 310 may have a shape that is easy to grip. That is, the load bar 310 can function as a user's gripping instrument. By providing the load bar 310, the present invention can provide a gripping region for facilitating the winding operation. Assuming that the flexible display panel 100 is rolled down while the panel roller 150 is fixed, the rolled-up flexible display panel 100 can maintain a flat state due to the weight of the load bar 310. This means that when the load bar 310 has a predetermined load, the flexible display panel 100 can be provided with a force that pulls the wound flexible display panel 100 in the direction of gravity. By providing a load bar 310 having a predetermined load at the other end of the flexible display panel 100, the movement of the wound flexible display panel 100 is restricted and restricted unless other external force is provided.

  The other end of the first elastic member 300 is connected to the other end of the flexible display panel 100. As an example, an auxiliary bar 320 may be further provided at the other end of the flexible display panel 100, and the other end of the first elastic member 300 is fixed to the auxiliary bar 320. The auxiliary bar 320 has a predetermined rigidity. When the first elastic member 300 is directly fixed to the other end of the flexible display panel 100, the flexible display panel 100 is provided with stress due to the restoring force of the first elastic member 300 and can be damaged. The first embodiment of the present invention further has an advantage that the auxiliary bar 320 is further provided to disperse and relax the stress provided to the flexible display panel 100, thereby minimizing damage to the flexible display panel 100. Have.

  Further referring to FIG. 13, the first elastic member 300 is elastically deformed within a certain range in conjunction with the winding and unwinding operations of the flexible display panel 100 and the back cover 200.

  When the flexible display panel 100 and the back cover 200 are wound around the panel roller 150, the flexible display panel 100 has a first direction (for example, along the surface of the back cover 200 with the soft magnet 250 interposed therebetween). , + Z direction). As the flexible display panel 100 and the back cover 200 are wound around the panel roller 150, the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200 increases in sequence. . The first elastic member 300 is sequentially pulled in accordance with the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200 ((a) → (b) in FIG. 13). (C)).

  When the flexible display panel 100 and the back cover 200 are unwound from around the panel roller 150, the flexible display panel 100 has a second direction (for example, along the surface of the back cover 200 with the soft magnet 250 interposed therebetween). -Z direction).

  As the flexible display panel 100 and the back cover 200 are unwound from the panel roller 150, the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200 decreases sequentially. The first elastic member 300 is sequentially restored in accordance with the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200 ((c) → (b) in FIG. 13). → (a)). This means that a force for pulling the flexible display panel 100 can be provided to the flexible display panel 100 by the restoring force of the first elastic member 300.

  The first embodiment of the present invention further includes the first elastic member 300, so that the flexible display panel 100 and the back cover 200 can be smoothly slid and moved when the flexible display panel 100 and the back cover 200 are wound. to enable. Thereby, the 1st Embodiment of this invention can prevent the defect which the soft display panel 100 floats locally from the soft magnet 250. FIG.

  <Second Embodiment>

  A rollable display device according to a second embodiment of the present invention will be described below with reference to FIGS. FIG. 14 is a perspective view showing a rollable display device according to the second embodiment of the present invention. FIG. 15 is a diagram for explaining the structure and operation of the elastic structure.

  14 to 19 are diagrams for explaining the operating state of the rollable display device according to the second embodiment of the present invention.

  Referring to FIG. 14, the rollable display device according to the second exemplary embodiment of the present invention includes a panel roller 150, a flexible display panel 100, a back cover 200, a soft magnet 250, and an elastic structure 400.

  The panel roller 150 may have a substantially cylindrical shape. That is, the cross-sectional shape of the panel roller 150 may be a circle. However, the present invention is not limited to this, and the panel roller 150 may be implemented in any shape as long as the flexible display panel 100 can be easily wound.

  The panel roller 150 may be provided with an internal space that can accommodate the control board 30. The internal space may further include a fixing structure that can fix the control board 30. The fixed structure is provided inside the panel roller 150 to fix the control board 30, thereby preventing the control board 30 from being detached and preventing collision with other structures. This means that the movement of the control board 30 can be restricted and restricted inside the panel roller 150. However, the present invention is not limited to this, and the control board 30 can be provided outside the panel roller 150 as illustrated. In this case, the control board may be provided on the other side facing one side of the flexible display panel 100 fixed to the panel roller 150.

  A driving unit that drives the panel roller 150 may be provided in the internal space of the panel roller 150. The driving unit may be a tubular motor, but is not limited thereto. The driving unit is connected to a power generation unit such as a separate external power source or a built-in battery, and can receive power. The panel roller 150 can be rotated by receiving a rotational force from the driving unit. The flexible display panel 100 and the back cover 200 are wound and unwound around the panel roller 150 in conjunction with the rotational movement of the panel roller 150.

  The flexible display panel 100 includes a display area where an input image is implemented. The display area is defined in at least a partial area of the flexible display panel 100. The display area includes a number of pixels. In the drawings, the case where the planar shape of the flexible display panel 100 has a substantially rectangular shape is shown as an example, but the present invention is not limited to this. The planar shape of the flexible display panel 100 may be a free form including a circle.

  The flexible display panel 100 is wound and unwound around the panel roller 150. The back cover 200 is provided in the back direction of the flexible display panel 100 and supports the flexible display panel 100. The back cover 200 is wound and unwound around the panel roller 150 together with the flexible display panel 100.

  In the region where the flexible display panel 100 and the back cover 200 start to be wound, the one end of the back cover 200 and the one end of the flexible display panel 100 are fixed to each other. This means that the one end of the flexible display panel 100 and the one end of the back cover 200 are fixed, and their movements can be restricted and restricted.

  One end of the fixed flexible display panel 100 and one end of the back cover 200 are fixed to the panel roller 150. One area of the panel roller 150 in which one end of the flexible display panel 100 and one end of the back cover 200 are fixed is an area where the flexible display panel 100 and the back cover 200 start to be wound. For this reason, an adhesive member or a fixing member for fixing these is provided between one end of the flexible display panel 100 and the panel roller 150 or between one end of the back cover 200 and the panel roller 150. Further can be provided.

  The soft magnet 250 is fixed to one surface of the back cover 200 that faces the flexible display panel 100. The soft magnet 250 is provided between the flexible display panel 100 and the back cover 200 and guides a sliding operation corresponding to a length deviation generated when the flexible display panel 100 and the back cover 200 are wound and unwound.

  When the flexible display panel 100 and the back cover 200 are unwound from the panel roller 150, the sliding of the flexible display panel 100 is not smooth due to the magnetic force of the soft magnet 250, and the flexible display panel 100 is localized from the surface of the back cover 200. Defects that float on the surface can occur. In order to prevent this, the second embodiment of the present invention further includes an elastic structure 400.

  Referring further to FIG. 15, the elastic structure 400 includes a fixed base member 401, a slider 410, and a second elastic member 420. There may be a plurality of elastic structures 400. The plurality of elastic structures 400 may be provided at a predetermined interval. The number of elastic structures 400 and / or the distance between adjacent elastic structures 400 is selected in consideration of the size and weight of the flexible display panel 100 and the back cover 200, the allowable load of the second elastic member 420, and the like. The elastic structure 400 guides smooth sliding of the flexible display panel 100.

  The fixed base member 401 is fixed to a fixed body 501 that does not move with the wall. That is, the fixed base member 401 is fixed at an arbitrary predetermined position such as a wall surface or the ground, and the movement is restricted. For example, the fixed base member 401 is fastened to the frame 503 fixed to the wall. The fixed base member 401 includes a guide groove 403 to which the slider 410 is fastened so as to be slidable. The guide groove 403 is provided so as to extend in the Z-axis direction, and can guide the sliding direction of the slider 410.

  The slider 410 includes a guide part 411 and a fastening part 415. The guide part 411 and the fastening part 415 are fixed to each other via a fastening member such as a screw.

  The guide part 411 is fastened to the fixed base member 401 so as to be movable in the Z-axis direction. The guide part 411 includes a guide protrusion 413 that is movably drawn into the guide groove 403. The guide protrusion 413 is drawn into the guide groove 403 and can move along the extending direction of the guide groove 403. This means that the movement of the slider 410 is limited in the extending direction of the guide groove 403.

  One end of the fastening portion 415 is disposed between the flexible display panel 100 and the back cover 200 and is fixed to the flexible display panel 100. This means that the slider 410 and the flexible display panel 100 are connected and interlocked with each other.

  The data PCB 20 is fixed to the other end of the fastening portion 415. In this case, since the flexible display panel 100 fixed to one end of the fastening portion 415 and the data PCB 20 fixed to the other end of the fastening portion 415 are linked to each other, the first connecting the flexible display panel 100 and the data PCB 20 is performed. There is an advantage that damage to the connecting member 25 can be prevented. The control board 30 connected to the data PCB 20 is fixed to one side of the fixed body 501.

  The second elastic member 420 may be provided so as to be elastically deformable along the Z-axis direction. For example, the second elastic member 420 is fastened to the protruding portion 414 protruding in the −Z axis direction from the guide portion 411 so as to be movable and deformable. The projecting portion 414 is fastened so as to be able to be pulled in and pulled out from a pulling groove 404 provided in the fixed base member 401. The lead-in groove 404 is formed at a position corresponding to the protruding portion 414 in a certain region of the fixed base member 401, and can have a groove shape recessed in the Z-axis direction, and has a hole shape penetrating in the Z-axis direction. Can do. Although not shown, in order to prevent the second elastic member 420 from being detached from the protrusion 414, a stopper may be further provided in a region where the protrusion 414 and / or the lead-in groove 404 is provided. it can. The stopper restricts the movement of the protruding portion 414 so that the protruding portion 414 is not completely detached from the drawing groove 404.

The second elastic member 420 is compressed when the slider 410 is slid in the −Z-axis direction by the provided external force. The second elastic member 420 is elastically restored when the external force provided to the slider 410 is released. At this time, the slider 410 receives an elastic force from the second elastic member 420 and is slid in the + Z-axis direction.
16 and 17 are diagrams for explaining an operation state of the rollable display device in the case of Outer rolling. 18 and 19 are diagrams for explaining the operation state of the rollable display device in the case of inner rolling.

Referring to FIGS. 16 and 17, the rollable display device is implemented by an outer rolling method. The elastic structure 400 includes a second elastic member 420, and the second elastic member 420 is deformed corresponding to a length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200. The When the flexible display panel 100 is in the second state, the length deviation is based on the position of the other end of the flexible display panel 100 and the end of the other end of the back cover 200 (or the size deviation from the reference). ).
As an example, the second elastic member 420 may be a compression spring. When the length deviation between the flexible display panel 100 and the back cover 200 increases, the compression spring is compressed correspondingly, and the length deviation between the flexible display panel 100 and the back cover 200 decreases. In this case, elastic restoration is performed correspondingly. That is, the second elastic member 420 is elastically deformed within a certain range in conjunction with the winding and unwinding operations of the flexible display panel 100 and the back cover 200.

  Specifically, when the flexible display panel 100 and the back cover 200 are wound around the panel roller 150 (circle 1), the flexible display panel 100 is placed on the back cover 200 with the soft magnet 250 interposed therebetween. Sliding (circle 2) in the first direction (-Z direction) along the surface. As the flexible display panel 100 and the back cover 200 are wound around the panel roller 150, the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200 increases in sequence. . Corresponding to the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200, the slider 410 is sequentially lowered (circle 3), and the second elastic member 420 is interlocked with this. These are sequentially compressed (circle 4) (FIG. 16).

  When the flexible display panel 100 and the back cover 200 are unwound from the periphery of the panel roller 150 (circle 1 ′), the flexible display panel 100 is placed along the surface of the back cover 200 with the soft magnet 250 therebetween. Sliding (circle 2 ′) in two directions (+ Z direction). As the flexible display panel 100 and the back cover 200 are unwound from the panel roller 150, the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200 decreases sequentially. Corresponding to the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200, the slider 410 sequentially rises (circle 3 ′), and the second elastic member 420 sequentially restores. (Circle 4 '). This means that the slider 410 is lifted by the restoring force of the second elastic member 420, and a force for pulling the flexible display panel 100 is provided to the flexible display panel 100 in conjunction with this (FIG. 17).

  Referring to FIGS. 18 and 19, the rollable display device is implemented by an inner rolling method. The elastic structure 400 includes a second elastic member 420, and the second elastic member 420 can be deformed corresponding to a length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200. . As an example, the second elastic member 420 may be a compression spring. When the length deviation between the flexible display panel 100 and the back cover 200 increases, the compression spring is elastically restored correspondingly, and the length deviation between the flexible display panel 100 and the back cover 200 decreases. If so, it is compressed accordingly. That is, the second elastic member 420 is elastically deformed within a certain range in conjunction with the winding and unwinding operations of the flexible display panel 100 and the back cover 200.

  Specifically, when the flexible display panel 100 and the back cover 200 are wound around the panel roller 150 (circle 1), the flexible display panel 100 places the soft magnet 250 in between and the back cover 200. Is sliding (circle 2) in the second direction (+ Z direction) along the surface. As the flexible display panel 100 and the back cover 200 are wound around the panel roller 150, the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200 increases in sequence. . In response to the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200, the slider 410 sequentially rises (circle 3), and the second elastic member 420 is restored (circle 4). Is done. This means that the slider 410 is lifted by the restoring force of the second elastic member 420, and a force for pulling the flexible display panel 100 is provided to the flexible display panel 100 in conjunction with this (FIG. 18).

  When the flexible display panel 100 and the back cover 200 are unwound from the periphery of the panel roller 150 (circle 1 ′), the flexible display panel 100 is placed along the surface of the back cover 200 with the soft magnet 250 therebetween. Sliding (circle 2 ′) in one direction (−Z direction). As the flexible display panel 100 and the back cover 200 are unwound from the panel roller 150, the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200 decreases sequentially. In response to the length deviation between the other end of the flexible display panel 100 and the other end of the back cover 200, the slider 410 sequentially descends (circle 3 ′), and in conjunction with this, the second elastic member 420 is sequentially compressed (circle 4 ′) (FIG. 19).

  The second embodiment of the present invention further includes an elastic structure 400 to enable a smooth sliding operation of the flexible display panel 100 when the flexible display panel 100 and the back cover 200 are wound and unwound. To. Thereby, the 2nd Embodiment of this invention can prevent the defect which the soft display panel 100 floats locally from the soft magnet 250. FIG.

  <Third Embodiment>

  Hereinafter, a rollable display device according to a third embodiment of the present invention will be described with reference to FIGS. 20 to 23 are views for explaining a rollable display device according to the third embodiment of the present invention. 20 and 22 are enlarged views of the AR area.

  Referring to FIGS. 20 and 21, the rollable display device according to the third embodiment of the present invention further includes a support structure 700. The support structure 700 is provided at the edge of the side of the back cover 200. The side side means a side extending in a direction (Z-axis direction) aligned with a direction in which the flexible display panel 100 and the back cover 200 are wound and unwound.

  The side of the flexible display panel 100 is drawn into the internal space provided by the combination of the support structure 700 and the back cover 200. That is, the support structure 700 is provided so as to surround the front edge of the flexible display panel 100 and the side surface of the flexible display panel 100. Thereby, the detachment of the flexible display panel 100 can be prevented. This means that the movement of the flexible display panel 100 is limited to the winding and unwinding directions of the flexible display panel 100.

  The support structure 700 includes a front body 701 and a middle body 705. The front body 701 is disposed to face the back cover 200 with the flexible display panel 100 interposed therebetween. The middle body 705 is disposed between the front body 701 and the back cover 200 and fixes the front body 701 to the back cover 200. The front body 701, the middle body 705, and the back cover 200 can be integrally formed, and can be fastened to each other after being formed separately.

  The front body 701, the middle body 705, and the back cover 200 can be formed of the same material, and at least one of the front body 701, the middle body 705, and the back cover 200 is formed of a material different from the other one. Is done.

  The front body 701 may include a superelastic shape memory alloy. The superelastic shape memory alloy has a low elastic modulus when the flexible display panel 100 is wound, and can be easily wound together with the flexible display panel 100. Further, when the flexible display panel 100 is unwound, the elastic modulus is increased and the restoring force is excellent, so that it is easy to maintain a flat state together with the flexible display panel 100.

  Still referring to FIG. 22, the support structure 700 is composed of segments 702 divided into n (n is an integer of 2 or more). Each segment 702 may have a bar shape extending in a direction (x-axis direction) intersecting the winding direction (Z-axis direction). The segments 702 are arranged along the winding direction (z-axis direction). In the third embodiment of the present invention, the support structure 700 divided in the segment form is provided, so that the flexible display panel 100 can be wound and unwound while the flexible display panel 100 is prevented from being detached. Can be performed smoothly without limitation.

  Referring further to FIG. 23A, a third elastic member 707 may be provided between the adjacent segments 702a and 702b in at least a partial region. The third elastic member 707 connects the adjacent segments 702a and 702b. For example, one end of the third elastic member 707 is connected to any one of the adjacent segments 702a and 702b, and the other end is connected to the other one of the adjacent segments 702a and 702b. The third elastic member 707 can move elastically corresponding to the interval between the adjacent segments 702a and 702b. The third elastic member 707 may be a tension spring, but is not limited thereto.

  More specifically, the interval between the adjacent segments 702a and 702b becomes narrower as the flexible display panel 100 changes from the second state to the first state. That is, the interval between the adjacent segments 702a and 702b becomes wider as the flexible display panel 100 is wound, and becomes narrower as the flexible display panel 100 is unwound.

When the flexible display panel 100 is in the first state, the third elastic member 707 can maintain the original state. This means that no external force is provided to the third elastic member 707. When the flexible display panel 100 is in the second state, the third elastic member 707 is elastically deformed. This means that the third elastic member 707 is pulled by the provided external force. At this time, a restoring force for maintaining the original state acts on the third elastic member 707.
According to a preferred embodiment of the present invention, when the flexible display panel 100 changes from the first state to the second state by connecting the segments 702a and 702b adjacent to each other using the third elastic member 707, or the second When in a state, adjacent segments 702a, 702b can easily have or remain flat. This means that when the flexible display panel 100 changes from the first state to the second state or in the second state, an accurate alignment is possible between the adjacent segments 702a and 702b. it can.

  Further referring to FIGS. 23B and 23C, all the segments 702 are connected using at least one third elastic member 707. However, the present invention is not limited to this, and the third elastic member 707 can be provided only between the adjacent segments 702 in a certain partial region. There may be a plurality of partial areas, and the partial areas are spatially separated from each other.

  <Fourth Embodiment>

  Hereinafter, a rollable display device according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 24 is a diagram for explaining a rollable display device according to the fourth embodiment of the present invention.

  Referring to FIG. 24, the rollable display device includes a storage unit having a housing 600. The housing 600 determines the outer shape of the storage unit. An internal space in which the panel roller 150 can be accommodated is provided inside the housing 600. The internal space of the housing 600 may further include a fixing structure that can fix the panel roller 150.

  The housing 600 further includes a slot 600a that opens the internal space. The slot 600a means an area opened in the housing 600, and functions as an entrance through which the flexible display panel 100 is drawn. The slot 600a may have a preset width and length that the flexible display panel 100 can easily pull in and out.

  The housing 600 may be formed to have a cylindrical shape and may have a circular cross section, but is not limited thereto. The housing 600 may be implemented in any shape as long as it can accommodate a structure such as the panel roller 150 in its internal space.

  The flexible display panel 100 wound and unwound around the panel roller 150 comes out or enters the inside via the slot 600a. At this time, the flexible display panel 100 may be damaged by collision and friction with at least a part of the cut surface defining the slot 600a.

  In the fourth embodiment of the present invention, among the cut surfaces that define the slot 600a, the cut surface 601 that comes into contact with the flexible display panel 100 when the flexible display panel 100 is drawn and pulled out has a predetermined curvature. Form. Thus, according to the fourth embodiment of the present invention, when the flexible display panel 100 is pulled in and pulled out, the flexible display panel 100 and the cut surface 601 of the housing 600 collide, and the flexible display panel 100 is damaged. This has the advantage that it can be prevented.

  The storage portion has a locally rigid structure. That is, according to the fourth embodiment of the present invention, the housing 600 is cracked, bent, or formed by forming at least a partial region of the housing 600 vulnerable to the provided external force thicker than other regions. Distorted defects can be prevented. The external force provided to a partial area of the housing 600 is an external force such as compression, bending, or twisting that is provided to the housing 600 while the flexible display panel 100 is in contact with the housing 600 when the flexible display panel 100 is pulled in and pulled out. obtain.

  The housing 600 includes a first portion P1 (portion) having a thickness different from each other and a second portion P2. The first portion P1 is a partial region adjacent to the cut surface 601 that is in contact with the flexible display panel 100 among the cut surfaces that define the slot 600a. The first portion P <b> 1 is a region that is vulnerable to an external force provided through the flexible display panel 100 when the flexible display panel 100 is pulled in and pulled out. The second portion P <b> 2 is a region that is not vulnerable to external force by the flexible display panel 100.

  The local rigid structure can be realized by forming the thickness t1 of the first portion P1 thicker than the thickness t2 of the second portion P2. According to the fourth embodiment of the present invention, the housing 600 is cracked or bent by an external force such as compression, bending, and twisting provided through the flexible display panel 100 by providing a local rigid structure. Or distortion which is distorted can be prevented.

  A person skilled in the art can make various changes and modifications without departing from the technical idea of the present invention through the contents described above. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the appended claims.

Claims (16)

A flexible display panel capable of winding and unwinding;
A back cover fixed to one end of the flexible display panel and wound and unwound together with the flexible display panel;
A rollable display device including a soft magnet fixed to any one of the flexible display panel and the back cover between the flexible display panel and the back cover. The soft magnet is divided into a plurality of pieces,
2. The rollable display device according to claim 1, wherein at least one of an interval between the adjacent soft magnets, a magnetic strength of the soft magnets, and an arrangement density of the soft magnets is different depending on a position. A first elastic member having one end connected to the other end of the flexible display panel and the other end connected to the other end of the back cover;
The first elastic member is
When the flexible display panel and the back cover are wound and unwound, the elastic display panel is elastically deformed corresponding to a length deviation between the other end of the flexible display panel and the other end of the back cover. Item 12. The rollable display device according to Item 1. The first elastic member is
When the flexible display panel and the back cover are wound, they are pulled corresponding to the increase in the length deviation, and when the flexible display panel and the back cover are unwound, the length deviation is reduced. The rollable display device according to claim 3, wherein the rollable display device is restored. A load bar fixed to the other end of the back cover;
The rollable display device according to claim 3, wherein the other end of the first elastic member is connected to the load bar. An auxiliary bar fixed to the other end of the flexible display panel;
The rollable display device according to claim 3, wherein one end of the first elastic member is connected to the auxiliary bar.   The rollable display device according to claim 1, further comprising a panel roller on which the flexible display panel and the back cover are wound and unwound. A panel roller fixed to one end of the flexible display panel and one end of the back cover, and the flexible display panel and the back cover being wound and unwound;
An elastic structure connected to the other end of the flexible display panel;
The elastic structure is
A fixed base member fixed in a predetermined position;
A slider that is slidably fastened to the fixed base member, and one end of which is fixed to the other end of the flexible display panel between the flexible display panel and the back cover;
A second elastic member having one end connected to the fixed base member and the other end connected to the slider and elastically deformed along a sliding direction of the slider;
The second elastic member is
When the flexible display panel and the back cover are wound and unwound, the elastic display panel is elastically deformed corresponding to a length deviation between the other end of the flexible display panel and the other end of the back cover. Item 12. The rollable display device according to Item 1. The flexible display panel has a front surface in which a display area is defined and a back surface opposite to the front surface. The flexible display panel is wound in the back direction of the flexible display panel (Outer rolling).
The length deviation increases as the flexible display panel and the back cover are wound, and decreases as the flexible display panel and the back cover are unwound.
In response to the increase in the length deviation, the slider is lowered, the second elastic member is compressed,
The rollable display device according to claim 8, wherein the second elastic member is restored and the slider is raised in response to a decrease in the length deviation. The flexible display panel has a front surface in which a display area is defined and a back surface opposite to the front surface, and is wound toward the front surface of the flexible display panel (Inner rolling).
The length deviation increases as the flexible display panel and the back cover are wound, and decreases as the flexible display panel and the back cover are unwound.
In response to the increase in the length deviation, the second elastic member is restored, the slider is raised,
The rollable display device according to claim 8, wherein the slider is lowered and the second elastic member is compressed in response to the decrease in the length deviation.   The flexible display panel and the back cover are provided at the edge of the side of the back cover extending in a direction aligned with the winding and unwinding direction, and the front edge of the flexible display panel and the side surface of the flexible display panel are provided. The rollable display device of claim 1, further comprising an enclosing support structure. The support structure is
A front body facing the back cover with the flexible display panel in between;
Including a middle body disposed between the front body and the back cover;
The front body is
The rollable display device according to claim 11, comprising a superelastic shape memory alloy (Superelastic Nitinol Alloy). The support structure is
Including multiple segments,
The plurality of segments are:
The rollable display device according to claim 11, wherein the flexible display panel and the back cover are arranged along a direction aligned with a winding and unwinding direction of the back cover.   The rollable display device according to claim 13, further comprising a third elastic member provided between the adjacent segments in at least a partial region and connecting the adjacent segments to each other. A panel roller on which the flexible display panel and the back cover are wound and unwound;
A storage section for storing the panel roller therein;
The storage section is
A housing;
An internal space of the housing, and a slot into which the flexible display panel and the back cover are drawn in and pulled out,
2. The rollable display device according to claim 1, wherein a cut surface that comes into contact with the flexible display panel when the flexible display panel is drawn in and pulled out of the cut surfaces that define the slot has a preset curvature. The housing includes a first portion and a second portion having different thicknesses,
The first part is
16. The cut surface defining the slot is a region adjacent to the cut surface that is in contact with the flexible display panel when the flexible display panel is drawn in and pulled out, and is thicker than the second portion. Rollable display device.

Images